System components and controlled parameters

of structural health monitoring (SHM) systems

Depending on the tasks that are to be solved by means of SHM system implementation, the SHM system may include one or more subsystems. The table below shows available types of SHM systems as well as recommended sensor types.

Subsystem type (type of measurements) Controlled parameter Module/ digital sensor type Recommended (depending on the number of floors) amount of digital sensors per 1000 square meters of the facility foundation 
up to 7 floors from 8 up to 17 floors from 18 up to 30 floors over 31 floors
Stress-strain state control stress-strain ZET 7010-DS
ZET 7110-DS
8…16 12…20 16…24 16…28
bending ZET 7054
ZET 7154
8…16 12…20 16…24 16…28
Building tilt and elements displacement control displacement ZET 7140-S + eddy current sensor ВС 701-17 Depending on the amount of the controlled elements
displacement ZET 7080-I + RF603
ZET 7180-I + RF603
Depending on the amount of the controlled elements
tilt ZET 7054
ZET 7154
8…16 12…20 16…24 16…28
Natural frequency and logarithmic decrement control  acceleration, fundamental tone, decrement ZET 7150 6…24 9…36 12…48 15…60
acceleration ZET 7152 2…4 3…6 4…8 5…10
velocity ZET 7156 2…4 2…4 2…4 2…4
Foundation subsidence control  strain ZET 7010 + primary transducer
ZET 7110 + primary transducer
Depending on the amount of the controlled elements
pressure ZET 7010 + primary transducer
ZET 7110 + primary transducer
Depending on the amount of the controlled elements
Seismic impact level acceleration ZET 7050 6…12 6…12 6…12 6…12
velocity ZET 7156 2…4 2…4 2…4 2…4
ground waters level ZET 7112-I 2…4 2…4 2…4 2…4
temperature ZET 7020
ZET 7120
ZET 7023
ZET 7123
2…4 2…4 2…4 2…4
atmospheric pressure ZET 7112-A 2…4 2…4 2…4 2…4
hydro-dynamic noise ВС 314-M 2…4 2…4 2…4 2…4
Seismic impact effects control acceleration ZET 7152 2…4 2…4 2…4 2…4
duration

In the course of SHM system creation the sensors are united in measuring lines, which are based on one of the two interface types (RS-485 or CAN).

The measuring lines are equipped with interface converters providing transfer of the registered data from digital sensors to the SHM PC (i.e. to industrial PC of the data acquisition node or to a server) via Ethernet interface. The data acquisition nodes are formed by one or several measuring lines.

The digital sensors are placed on the structural elements of the controlled object while the remaining modules (included into the data acquisition nodes) are placed in the electrical cabinets of the data acquisition nodes.

Module type Item Function (application sphere) Recommended amount
ZET 7076 interface converter RS-485 For connection of the digital sensor to industrial PC or server via Ethernet interface (in the case if measuring lines with RS-485 interface are used) depends on the measuring lines amount
ZET 7175 Glonass/GPS synchronization module For timing synchronization of the data received from data acquisition nodes (in the case if the timing synchronization of the recorded signals is necessary) depending on the data acquisition nodes amount
ZET 7176 CAN interface converter For connection of digital sensors to industrial PC or a server via Ethernet interface (in the case if measuring lines with CAN interface are used) depends on the CAN measuring lines amount
ZET 7177 data transfer modules via GSM wireless channel For creation of additional channel used for data transfer from data acquisition modules to the server. This channel can also be used as a main channel in the case if it is impossible to establish wired connection between data acquisition nodes and the server (i.e. when it is impossible to establish wire connection between data acquisition node and computing system) depending on the data acquisition nodes amount
ZET 7173 flash-drive module Used for performing buffer memory functions. The module records data (received from the measuring line sensors) in loop mode to the flash-drive (in the case if there is no PC in the data acquisition node) depends on the CAN measuring lines amount
ZET 7160 digital port Used for formation of notifications signals with TTL electrical level (in the case if there are any requirements for corresponding logical signals) оne module per SHM system
ZET 7161 control module Used for formation of “dry contact” notifications signals (in the case if there are any requirements for corresponding “dry contact” signals) оne module per SHM system
MRD 20-24 power converter Used for power supply of digital sensors and data acquisition modules of SHM system (in the case if there are measuring lines and a PC within the structure of SHM system. depending on the total amount of measuring lines and PC-s in the SHM system
ESD-205A
ESD-208A
switching center Used to increase the amount of connection ports of the local SHM system based on Ethernet interface depending on the data acquisition nodes amount
NISE 2110A industrial PC Used for off-line processing of the data received from the sensors of the data acquisition node (in the case if the data acquisition node is used as for off-line signals processing) depending on the data acquisition nodes amount

Data acquisition nodes can also be equipped with additional instruments such as media-converters for data transfer via fiber-optic line, WiFi or WiMax module for wireless access, etc. Implementation of such instruments enables larger scale and high reliabilty of the structural health monitoring system.

Data acquisition nodes signals are transferred to the computation systems for the purpose of further processing and obtained results analysis. The instruments included into computation system of the SHM are described in the table below.

Instrument type Function
SHM server SHM system data acquisition and long-term storage
WKS of SHM system operator Visual representation of SHM system operation
SHM system WKS simulator It is used to select installation areas of the seismic receivers in the course of design and survey works. The simulator also allows to set and check Software parameters at the stage of test and inductrial operation of the SHM system.

Software component

of the SHM system

Industrial PC-s (in the case if they are used in the SHM data acquisition node) should have Windows OS as well as special software applications, listed in the table below:

Software File name (type)
ZETLAB (required) ZETLab.msi (installation file)
SCADA-system ZETVIEW (option) ZETView.msi (installation file)
OPC library (option) OPC Core Components Redistributable (X64).msi
OPC Core Components Redistributable (X86).msi
 Maria DB (option) mariadb-10.0.5-win32.msi (installation file)
mariadb-10.0.5-winx64.msi (installation file)
ODBC – driver MySQL (option) mysql-connector-odbc-5.1.11-win32.msi (installation file)
mysql-connector-odbc-5.1.11-winx64.msi (installation file)
Monitoring service 1.0 (hardware – WathDog) (required) setup.exe (installation file)
Software for recording and visual representation of long-term trends by all registered channels within the scope of  ZETLAB Software (required) ZETLab.msi (installation file)
SCADA-project of SHM data acquisition node for the control of threshold levels by measuring channels, alarm signal notification with automated or manual threshold level value control (option) smik_kpu.zvx
Software for automated control of natural oscillations and logarithmic decrement (option) smik_ldz.zvx
Settings of data acquisition node PC (required) smik.txt (configuration file)
Server settings ZET.OPC.1 (option) smik_server.zoc (configuration file)
Autorun settings (required) Exestarter.xml (configuration file)
Auxiliary file (option) smik_server_db.sql (installation file)

Operation principles

of the equipment within the scope of SHM system

Signals from various sensors are transferred to the data acquisition node PC (if any) by means of interface convertrs, and then – to the server for further storage in the data base.

Each of the registered signals is compared to the set threshold level values. In the case if the set threshold values are exceeded, there is formed a signal for the operator’s notification. As the signal is formed, the notification message is displayed at the operator’s WKS display (the message requires that the operator should acknowledge receipt of the displayed information). Thus, it is impossible to ignore the notification signal.

In addition to that, the information of the set threshold level exceeding is also saved in the events log.